Electric incandescent lamp.



P. W. ERIOKSON. ELECTRIC INCANDESCENT LAMP. APPLICATION FILED JAN. 2a, 1908.

904,609. Patented Nov. 24, 1908.

, FREDERIC W. ERIGKSON, OF NEW YORK, N. Y.

' ELECTRIC INCANDESCENT LAMP.

Specification of Letters Patent. I

Patented Nov. 24, 1908.

Application filed January 28, 1908. Serial No. 413,022.

To all whom it may concern:

Be it known that I, FREDERIC N. ERICK- son, residing at New York, in the county of New Yorkand State of New York, have invented certain Improvements in Electric Incandescent Lamps, of which the following is a specification.

The present invention relates to light diffusers as colored electricaincandescent lamps 1O such as are used for border lights and foot lights on theater stages and other similar places where it ,is desired to produce the effect of colored radiated light... In the lamps commonly used to obtain the color required the clear lamps are dipped in a lacquer of'the color and allowed to dry, and when in use such lamps are very unsatisfactory, as the amount of reflected colored light on a reflecting surface isVerysmaIl; and as the lacquer tends to retain considerable heat it is soon burned off and the lamp has to be redipped to keep the color efi'ect uniform.

The invention about to be described consists in the employment of the common clear lamp inclosed in a hemispherical metal reflector section to which is locked a hemispherical colored glass section, or both sections may be made of glass, in either case the said sectlons belng 'of larger diameter than the inclosed lamp in order to provide a space between the same into which are made openings at the top and bottom to create a draft of air to ventilate the spaceand keep the surfaces cool, all of which I will now proceed to describe and point out in the appended claims. I

In the drawings which form a part of and illustrate this specificationFigure 1 is a side view partly broken away, of a'device embodying my invention. \Fig. 2 is a top view of the same. Fig. 3 is a section on line on a; of Fig. 1.

In the drawings E is an electric'incandescent lamp of the standard type attached to its socket D, made in a manner well understood.

A is preferably a metallic section whose inner surface is adapted for light reflecting purposes, and is provided with a series of holes 2' near its bottom edge and with a hood (2 at its top having openings f in its side.

general configuration as the section A, and adapted to lock therewith by means of a lip a on each side ofthe section A forming a rabbet on the inner side which incloses and embraces'the edges 5 of the section B. Near the bottom of the sections is an outer groove 0 formed byfa projection (Z around the sections, and supported in the groove is an end less spiralspring which holds the sections together, and compresses them upon the shank of the lamp. The lip 0. extends over the section B and on each side upward from the groove 0, while the edges 7) of the section B are of the same curvature as the rest of its body, so that when the sections are to be placed together, the edges 7) are placed within the rabbet in the section A, and the sections brought firmly together and the {spring-band C passed over them and they are then held tightly together and to the shankof the lamp.

In order that the sections A and B may be held firmly to the globe of the lamp and centrallythereof, I provide a flat spring g riveted at one end by the rivets n n to the inner side of the section A as shown, while its free end is perforated and'incloses the sprue on the upper end of the lamp. It will be seen that the upper parts of the sections are locked against relative lateral movements-by the interengaging tongue and rabbet, and the lower parts are embraced by a resilient band. The sections A and B are of larger diameter than the lamp so that a space it is i left between, and when the lamp is lighted its heat causes air to enter the holes 2' and pass out the openings f of the hood 6 which keeps the surfaces of the lamp and sections cool.

By means of my invention a superior means isprovided for producing the maximum amount of reflected light, as the colored glass section is cheaply made, and of a character which enables the light rays to be fully transmitted. I may, if I choose, make both sections of glass, and may prepare the inside surface of one of them to serve as a reflector.

I claim as my invention 2- I 1. A light difiuser consisting of an electric incandescent lamp, a casing about the same composed of two sections having inter-- engaging edge portions, one section being a reflector, and the other colored glass, the sections being of larger diameter than the I lamp and having means for ventilating the B is a section of colored glass of the same space between them, means for separably holding the sections together, and means at the top of the lamp for holding the same steady with the sections.

2. A light diffuser, consisting of an incsndeseent lamp, a casing for the some composed of two portions, one oi which is a refieotor end the other adapted to color the light rays from the lamp and reflector, one portion having a tongue rabbet at their meeting edges end a resilient band encircling the casing.

3'. A light clifiuser conslstina of an imamdescent lamp having at plain giobe, a. casing about the some composed of two interlocking pearls, one of which constitutes a reflector and the other mode of colored giess, the said parts having a groove around their lower parts, with an endless spiral spring supported in said groove.

4. A light difi'user consisting of an inoan- I and the other a' eoeeoe desce t lamp with a plain globe, a casing inolosing the same compose of two portions having interengaging edges, each portion havin a groove around its lower part, with an on less spiral spring supported in said groove, whereby the two port ons are locked to each other'and held to the said lamp.

In testimony whereof, I have signed my name to thisspecifieation in the'presence of two subscribing witnesses, this 25th day of January 1908;

FREDERIC w; ERICKSON. Witnesses N. C. HAYJsEs, E. H; (loans. 

